The Tory leader promised that under a Conservative government taxpayers would be able to "Google" the pounds that are spent by Whitehall.

In a speech at the internet company's Californian headquarters, he said: "In the UK, my party is committed to transparency in government spending. The next Conservative government will detail every item of government spending over £25,000 on a public website."

Mr Cameron used a lightning visit to America’s west coast to attack Labour for allowing Britain to become one of the most centralised countries in the world.

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He said a Tory government would set people free from bureaucracy and make sure that schools, hospitals and other public services were not managed so minutely from "the top down."

He said people have a "pent up desire" to express themselves.

He told his audience in San Francisco: "Britain today is one of the most centralised countries in the democratic world. I don't think many of you would believe the degree to which a minister in our national government has top-down control of what happens in our schools, hospitals, roads and public spaces."

He warned that the bureaucratic era must be ended if Britain was to prosper.

"In the days before the information revolution, you could just about argue that you had to trust the state because it wasn't practical to share information, for people to make choices and take control.

"But thanks to all of you, that isn’t true any more. In commerce and in our culture you are helping to make the top-down model history. You have shown us the future - and it's bottom-up."

Mr Cameron has had his best week since he became leader. He has forced Gordon Brown to call off the planned election and witnessed Alistair Darling, the Chancellor, having to steal popular Tory policies on inheritance tax and the treatment of non-domicile foreigners working in Britain.

And on Wednesday he savaged Mr Brown at Prime Minister's Questions.

The Tory leader is now due to meet California governor Arnold Schwarzenegger.

The former film star has been in the vanguard of introducing green policies to the state.

In his speech Mr Cameron played on traditional Tory values of the small state and low regulation.

He said it was "wonderful" that the technological revolution was demanding less government interference.

And added: "For someone who comes, as I do, from the conservative political tradition; we've always been motivated by a strong and instinctive scepticism about the capacity of bureaucratic systems to deliver progress.

"Instead, we've always preferred to place our trust in the ingenuity of human beings, collaborating in messy and unplanned interaction, to deliver the best outcomes."